noun 1. a device that uses a moving needle and the tunnel effect to generate a maplike image of the atomic surface structure of matter, thereby achieving even greater magnification than the scanning electron microscope. scanning tunneling microscope A microscope used to make images of individual atoms on the surface of a metal. The microscope […]

(circuit design) A technique used to increase the controllability and observability of a logic circuit by incorporating “scan registers” into the circuit. Normally these act like flip-flops but they can be switched into a “test” mode where they all become one long shift register. This allows data to be clocked serially through all the scan […]

(circuit design) A digital logic circuit which can act either as a flip-flop or as a serial shift register and which is used to form a scan path. The most common design is a multiplexed flip-flop: ___ ____ normal in –| \ | | | |——|D Q|—- normal/scan output scan in —-|___/ mux | | […]

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